<div class="navbar-wrapper" >
      <div class="container" >

        <nav class="navbar navbar-inverse navbar-static-top" >
          <div class="container">
            <div class="navbar-header">
              <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
              </button>
              <a class="navbar-brand" href="#">电影大世界</a>
            </div>
            <div id="navbar" class="navbar-collapse collapse">
              <ul class="nav navbar-nav">
                <li><a href="/">首页</a></li>
                <li><a href="/register">注册</a></li>
                <li><a href="/login">登录</a></li>
                <li class="dropdown">
                  <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">电影频道 <span class="caret"></span></a>
                  <ul class="dropdown-menu">
                    <li><a href="#">正在热映</a></li>
                    <li><a href="#">即将上映</a></li>
                    <li><a href="#">Top250</a></li>
                    <li><a href="#">口碑榜</a></li>
                    <li><a href="#">北美票房榜</a></li>
                    <li><a href="#">新片榜</a></li>
                  </ul>
                </li>
              </ul>
            </div>
          </div>
        </nav>

      </div>
    </div>